Scraper for mixing-machines.



No. 675,798. Patented lune 4, I90I.

- C. F. SLIGER.

SCBAPEB FUR MIXING MACHINES.

(Application filed July 93, 1900-) (No Model.)

MI I I 0 mm uqam new" co, monnwna. msmvanrgn. u. c

CHARLES F. SLIGER, OF SAN ANTONIO, TEXAS, ASSIGNOR OF ONE-HALF TO CHARLES F. DUBOSE, OF SAME PLACE.

SCRAPER FOR MIXING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 675,798, dated June 4, 1901.

Application filed July 23,1900.

To all whom t may concern.

Be it known that I, CHARLES F. SLIGER, a citizen of the United States, residing at San Antonio, in the county of Bexar and State of Texas, have invented a new and useful Scraper for Mixing-Machines, of which the following is a specification.

This invention relates to mixing-machines in general, such as are employed in the mixing of asphalt and similar materials, and it has specific reference to a scraper attachment for the mixing-cylinder wherewith the material that may cling to the inner surface of the cylinder may be scraped off and the mixing operation may be thoroughly performed.

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in the several views thereof, Figure l is a central longitudinal section of a mixing-cylinder having a series of scrapers disposed therein and constructed in accordance with the present invention. Fig. 2 is a transverse section of Fig. 1 and showing a scraper in side elevation. Fig. 3 is a perspective view of the scraper.

Referring now to the drawings, 5 represents the cylinder of an asphalt mixing and heating machine, supported upon bearingrollers 6 and 7, which are in turn suitably journaled, as shown. This cylinder has open ends, and in practice the asphalt to be mixed is fed in at one end of the cylinder and is discharged at the opposite end, the cylinder being rotated during the operation and heated. During this operation of mixing and heating there is a tendency for the asphalt to cling to the inner surface of the cylinder, and in order to dislodge this material there is provided a series of independently-pivoted scrapers. These scrapers are mounted upon a shaft 10, which is supported in uprights 11 at the ends of the cylinder, said shaft being passed longitudinally through the cylinder, adjacent the upper side thereof and parallel with the axis of the cylinder. Each of the scrapers, as shown in Fig. 3 of the drawings, consists of a hub portion 12, having a radially-extending blade 13, the base of which is thickened and lies parallel with the axis of the hub, which is cylindrical, said blade being twisted so that its outer edge 15 lies at Serial No. 24,628. (No model.)

an angle to the axis of the hub, one side of the blade being concaved and the other side convex. The outer end of the blade is curved upwardly and its cutting or scraping edge is straight, as shown, and projects forwardly, so that it may enter or wedge under the clinging material.

In practice the scraping-blades lie in a common diagonal plane, and to hold them yieldably in these positions each blade is provided with a counterbalance consisting of a weight 18, slidably mounted upon an arm 19, extending radially from the hub 12 and at an obtuse angle to the extension of the blade, the weight being held in place upon the arm by a set-screw 20, whereby it may be shifted to vary its counterbalancing effect and correspondingly vary the stability of the scraper.

The scraper-blade is increased in width at its outer edge to project beyond the ends of the hub, whereby when a number of blades are disposed with their scraping edges parallel and the hubs in contact successively, as shown in Fig. 1 of the drawings, the edge of one blade will overlap the edge of the succeeding blade and the inner face of the cylinder or drum will be scraped continuously. This construction of the blades also affords passages between the blades for passage of the material that is scraped off.

In operation the scrapers are arranged as shown, and the material to be mixed is fed in at one end of the cylinder, the cylinder being rotated to effect the mixing operation, and the mixed material is discharged at the opposite end.

\Vhat is claimed is- 1. A scraper for mixing-drums comprising a cylindrical hub having an axial bearing therein to receive a shaft, a blade radiating from the hub, the inner end of the blade lying parallel with the axis of the hub and the edge of the outer end of the blade lying at an inclination to the axis, the inclination decreasing gradually from the outer end toward the inner end of the blade, an arm radiating from the hub at an angle to the blade, and a counterbalancing-weight mounted adjustably upon the arm.

2. A scraper for mixing-drums comprising a cylindrical hub having an axial bearing therein to receive a shaft, a blade radiating from the hub, the inner end of the blade lying parallel with the axis of the hub and the outer end of the blade being curved upwardly and having a straight edge lying at an angle to the axis of the hub, the inclination of the blade gradually decreasing from the outer end toward the inner end, and a counterbalaneing-arm radiating from the hub at an anto gle to the blade.

In testimony that I claim the foregoing as my own I have hereto aflixed my signature in the presence of two witnesses.

CHARLES F. SLIGER.

Witnesses:

W W. REW, G. G. IIOWLAND. 

